Coil for electrical purposes.



Patented May 10, 1910.

,M Atty.

fw, ,CJ nw t m w E@ UNITED STATES PATENT OFFICE.

ELBERT W. JODREY,

OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK. l

COIL FOB ELECTRICAL PURPOSES.

Specication of Letters Patent.

Application filed October 26, 1905. Serial No. 284,556.

To all whom tt may concern:

Be it known that I,FJLBERT W. JODREY, a citizen of the UnitedI States, residing at Lynn, county of Essex, and State of Massachusetts, have invented certain new and use- -ful Improvements in Coils for Electrical Purposes, of which the following is a specilication.

My present invention relates to coils or windings and more particularly to a coil or winding of insulated wire for electrical purposes, and com rises certain novel and useful features o i construction and arrangement of the coil and'its support and terminals.

The various features of novelty which characterize my invention are pointed out with articularity in the claims annexed to and orming a part of this specification. For a better understanding of my invention, however, reference may be had to the accompanying drawings and descri tive matter in which I have illustrated an described one of the forms in which my invention may be embodied.

Of the drawings, Figure 1 is a plan view of a finished coil; Fig. 2 is a sectional elevation of the coil shown in Fig. 1; Fig. 3 is a plan view of the coil shown in Figs. 1 and 2 when partly constructed; Fig. 4 is an end elevation of the coil with a portion in section; Fig. 5 is an elevation on an enlarged Iscale showin a partly finished terminal connection; andgFig. 6 is a similar view showing a finished terminal connection. A

In the articular embodiment of my invention disclosed in the drawings, 1 represents the coil support which may be formed of any suitable material, but which I have advantageously formed of a sheet of paper, pressboard, or the like rolled into a tube with the layers of the tube glued together. The coil shown comprises an inner section or layer of winding 2 and an outer section 3, sections 2 and 3 being separated by a layer of insulation 4. The insulation 4 I have advantageousl made of a sheet or strip of paper, clot or the like wrapped about the section 2. The inner end 5 of the insulated wire forming the coil section 2 is secured to a terminal connector 6 which is in .turn secured to the support 1 and has secured to it a terminal conductor 7. The

section 2 is secured to a strip of conductingl material 9 located between layers of insulation 4. The inner end 10 of the insulated conductor forming the coil section 3 is secured to a terminal connector 6 connected to the support 1 and having a terminal condnctor 7 secured to it in the same manner as the connector 6. The outer end 11 of `the conductor forming the outer ocoil section -3 is secured to the member 9, one end of which projects beyond the ends of the coil sections `2 and 8 for that purpose.

In forming the finished coil the coil section 2 is first wound u on the support 1. The end 5 may be secure by glue to the support 1 to facilitate the winding of the coil. The coil section may be wound in any suitable manner and by any suitable means. I have ordinarily wound the coil in a cop winding machine in which the turns of the coil are 'automatically so laid on the support that the ends of the coil are self supporting. After the coil section 2 is wound the inner end of the layer of paper or clothA forming the insulation 4 is ordinarily secured to the outer surfaces of the coil by glue or the like. The outer end 8 of the conductor forming the section 2 is then soldered to the inner end of the conductor 9 which is preferably formedpof tinned copper, and which is Secured to the outer surface of the inner end of 4the strip 4 in any suitable manner as by means of a piece of cloth or paper 12 which passes over the strip 9 and has its edges glued to the strip 4. After the end 8 is Secured in place the strip 4 is wound about the section 3. The strip 4 is formed near its -outer end with a slit 13. The inner end 10 of the conductor forming the coil section 3 passes through the slit or kerf 13. After the conductor forming the outer section is passed through the slit 13 and the strip 4 is wound about the coil section 2, the section 3 is wound, ordinarily by the same means employed to wind the coil section 2 and in the same manner. The slit 13 is so placed that a portion of the conductor forming the outer winding section is separated from the body of the winding of the section 2 b one or more thicknesses of the strip 4. en the winding of the coil section 3 is com leted a few of the outer turns are Ordinar' y moistened with glue in Order to set them and prevent their unwinding, after which the outer ceive it in the support 1 and are then bent loutwardly to lie against the inner surfaces of the support. The terminal 7 which is ordinarily of conductor stranded and considerably heavier than the wire composing" the windings of the sections 2 and 3, and may be provided at its outer end with a contact portion lll adapted to be secured undery a binding screw, etc., is'fastened to the support l by the staple like conductor 6 beneath the yoke portion of which its terminal is passed. The inner bared end of the conductor 7 is bent outward as shown in Fig. 5.V

The end 5 of the section which is also bared is then Wrapped about the outturned portion of the conductor 7 as at 5a. After this is done the out-turned portion of the conductor 7 is bent down against the outer surface of the connector 6. A. drop of solder is then preferably employed to permanently secure the parts 5, 6 and 7 together. The parts l0, 6 and 7 are secured together in the same manner. With this construction it i will be observed that in manipulating the terminals in connecting up the coil or otherwise, no strain 'is put upon the turns of the winding sections tending to disarrange the windings or to break the conductors forming them. On the contrary any force exerted on the terminal conductors 7 and 7 isimparted `directly to the coil support l to which they are stapled. Where as 1n many cases, the

conductors forming the coil sections 2 and 3 are very line wires, anchoring of the terminals to the support is of great practical importance. VThe connections of the-terminal conductors to the coil supports and the ends of the coil windings are simple and easily formed, and possess excellent electrical as well as .mechanical advantages. k These ad.

vantages are also possessed by the means eni-V ployed for connecting together the terminals4 of the coil sections 2 and 3.

The particular coil shown in the drawings is intended for use as a resistance in connection with measuring instruments or the like. If the turns of the coil sections 2 and 3 are -wound in the same'direction as described it will be observed that the coil as a whole is non-inductive. If the coil is to be used for magnetizing purposes the coil sections are either wound in opposite directions or the coils are connected in a different manner.

The use of the layer of insulating material 4 not only serves as a good mechanical superr/,ais

port for the conductor 9, but by dividing the winding into sections it increases its electrical strength and diminishes its liability to break down.

What ll claim as new, and desire to secure by Letters Patent of the United States, is,-

' l. ln a coil for electrical purposes, a tubular support of insulating material, a pair of staples, one secured to each end of said support, a winding on said support formed in two sections, one within the other,l said sections being separated from each other by a strip of paper wound about the i'nner section, one end ofthe conductor forming one section being secured to one staple and one end of the conductor forming the other sectionibeing secured to the other staple, and a strip 4of conducting material fastened to said strip with one end projecting by one end of the coil sections with the free end of' the conductor forming one section secured to the inner end of said conductor and the free end of the conductor forming the other section secured to the projecting end of said conductor.

2. ln a coil for electrical purposes, a tubular support of insulating mat'erial, a pair of staples one secured to each end of said support, a winding on said support formed in two sections, one Within the other, said sections being separated from each other by a strip of paper wound about the inner scction one end of the conductor forming one section being secured to one staple and one end of the conductor forming the other section being secured to the other staple, a strip of conducting material fastened to said strip of paperwith one end projecting by one end of the coil sections with the free end of the conductor forming one section secured to the inner `end of said conductor and the free end of the conductor forming the other section secured to the projecting end of said conductor, and terminal conductors anchored to said support by said staples.V

3. As an article of manufacture, a core of `insulating material, terminal conductors stapled to said core, and a conductor coiled about said core with its terminals secured to said terminal conductors.

4. In combination, a coil support in the form of a tubular body of iibrous insulating material, a terminal conductor stapled to said support, and -a conductor coiled about said `support with one end connected to said terminal conductor.

5. In a coil for electrical purposes, a support, a winding on said support in two sections arranged one within the other, a layer of insulating material between the sections, a conductor mechanically supported by said insulating material, one terminal of each section of the winding being connected to said conductor. g 6. In combinatlon, a Wlnding comprising two concentric ortions or sections, one my hand this twenty fourth' day of October, Within the other, nsnlatiofn between the sec 1905. tionsycomprising a ers o paper, a strip o conducting materia mechanically sup orted ELBERT W' JODREY' 5 between said layers, and terminals o each Witnesses:

section secured to -said conductor. JOHN A. MGMANUS, Jr., In witness whereof, I have hereunto set HENRY O. WESTENDARP. 

